Investigators said the officer was stabbed while responding to a threat on the fourth floor around 1 p.m.

"When officers responded, they were confronted by a subject, a male. One officer was stabbed in the neck," Capitol police Officer Dan Blackdeer said.

The officer, 66, was taken to Froedtert Hospital with non-life-threatening injuries. He is in stable condition.

Family members told WISN 12 News that Officer Greg Friberg was the man stabbed. He is a 10-year veteran of the Capitol Police Department.

Milwaukee police are the leading the investigation.

"At this time, this does not appear that this incident is an act of random violence," Milwaukee Police Department Assistant Chief Edith Hudson said.

The family said it needs time to understand exactly what happened to Frieberg inside the building.

The state office building was closed for the rest of the day Wednesday, but Milwaukee police said it should be open Thursday.

"Our thoughts are with our injured Capitol police officer, and we are thankful that he is in stable condition. We are also thinking about all of our officers who put themselves in harm’s way each day, and ask that you send your thoughts to everyone involved in this situation," said Department of Administration Secretary Mike Huebsch in a statement.